Ch6 v70 sfc_en

Training Center
for Automation and Drives
SIMATIC PCS 7 System Training
Configuring with SFCPage 1
Date: 07.12.2006
File:ST-PCS7SYS_V70_sfc.1
SIMATIC PCS 7
Siemens AG 2005. All rights reserved.
SITRAIN Training for
Automation and Drives
Cinfiguring Sequences with SFC
Content Page
Overview .......................................................................................................................................... 2
Sequence Structures ........................................................................................................................ 3
Action and Transition ........................................................................................................................ 4
Preprocessing and Postprocessing for a Sequencer ......................................................................... 5
Operating State Logic of a Sequencer .............................................................................................. 6
Exercise: Sequence Control - Temperature ..................................................................................... 7
Open SFC (in Test Mode) ................................................................................................................ 9
Sequence Control - Reactor ............................................................................................................. 10
Parameter Control via the SFC ......................................................................................................... 11
Notes ............................................................................................................................................... 12
SFC Operating Mode Logic .............................................................................................................. 13
Run Behavior of an SFC .................................................................................................................. 14
Restart Behavior of the SFC(1) ........................................................................................................ 15
Restart Behavior of the SFC(2) ........................................................................................................ 16
External View of SFC ....................................................................................................................... 17
Exercise: Adding Two Sequencers to the Sequential Control ............................................................ 18
Holding Sequencer with Data Block for Values to be Saved .............................................................. 19
Creating an SFC Type ...................................................................................................................... 20
Creating an SFC Instance ................................................................................................................ 21
Miscellaneous Reference Data ......................................................................................................... 22

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Overview
Menu bar
START
END
S1
S2 S3
S4
T1
T2
T3
T4
S1 to S4 Steps
T1...T4 Transitions
Element bar
SFC Flow Chart The chart topology, the action functions of the steps, the switching conditions of
the transitions and the runtime properties specify the flowchart created with SFC.
Editor Graphics are used to structure the flow chart. Connections with block parameters
already present in the CFC charts are used to configure the individual
components (steps and transitions). Therefore, there is no programming; instead,
you just access templates.
Insert You can select the structure symbols from the step symbol bar. You click the
symbols to insert them (before/after a transition). Steps are always inserted
together with the necessary transitions.
Step Double click the step symbol to begin configuring the step. You must fill out the
tabs for this. When configuring actions, you can use the "Browse…" button to
display the blocks contained in the CFC charts ("Magnifying glass") and transfer
their parameters to the action list.
Transition Double-click the transition symbol to begin configuring the transition. You must fill
out the tabs for this. The same things apply to configuring actions as to
configuring steps.
Runtime Properties The chart will be automatically inserted into the OB where the pointer for the
runtime sequence is positioned.
Compile/Download Compilation and download are performed in the same way as for CFC. All chart
information is maintained in the chart folder. The compilation result is entered in
the block folder and downloaded from there to the CPU.
Test The sequencer can be run and tested when the CPU is connected and test mode is selected (Test
menu). Double-click the step/transition symbol to display the current states.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Sequence Structures
S1
T12
S2
T23
Linear
S21S22
T23
T12
Parallel
S2 S3
T12 T13
T24 T34
Alternative
S2 T2
T23
Loop
S4S3
S3
S1 S1
T12
S1
S2
T2
T23
Jump
S3
T12
S1
S3
Linear Sequence Start position: S1 and T12 are active.
Step enabling: if T12 is fulfilled, then S1 becomes inactive, and S2 and T23
become active.
Parallel Branch Start position: S1 and T12 are active.
Step enabling: if T12 is fulfilled, then S1 is inactive, and S21, S22 and T23
become active.
Alternative Branch Start position: S1, T12 and T13 are active.
Step enabling:
1. If T12 is fulfilled, then S1 is inactive, and S2 and T24 are active (T13, S3, T34
inactive).
2. If T13 is fulfilled, then S1 is inactive, and S3 and T34 are active (T12, S2, T24
inactive).
3. If T12 and T13 are fulfilled, priority to the left is higher; the left branch is active.
Loop Start position: S1 and T12 are active.
Step enabling:
1. If T12 is fulfilled, then S2 is active, and T23 and T2 are active.
2. If T23 is fulfilled, S2 terminates and S3 is active.
3. If T2 is fulfilled, S2 terminates and is initialized again.
4. If T23 and T2 are fulfilled, then to S3.
Jump Start position: S1, T12 and T13 are active.
Step enabling:
1. If T12 is fulfilled, then S2 and T23 are active.
2. If T2 is fulfilled, then S3 and its following transition are active.
3. If T12 and T2 are fulfilled, priority to the left is higher; normal sequence (no
jump).

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Date: 07.12.2006
SIMATIC PCS 7
Action and Transition
Step active
Transition fulfilled
Cycles
Cycles
Actions Actions that determine what steps must do in the process (such as specify
parameters and trigger switching operations) must be configured within the step.
You can enter up to 50 actions per step section.
Step A step consists of actions that run in three sections:
Initialization Initialization is carried out once (for one program run from the OB) when the step
becomes active.
Processing This section is carried out for every run from the OB until the next transition is
fulfilled. If the transition is fulfilled, the terminating section (see below) is carried
out during the next OB run of the sequence.
Termination This section is carried out once, after the next transition is fulfilled. After the last
command, the step becomes inactive and simultaneously, the following step
becomes active (with its initialization), depending on the topology.
Transitions Transitions contain the step enabling conditions for the next step in the sequence.
You can evaluate the validity of up to 16 conditions using five logical gates. If you
mouse-click the gate or connecting line, you can convert it to AND, NAND, OR or
NOR.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Preprocessing and Postprocessing for a Sequencer
Possible for each individual
sequencer
If Blue background
=
Tab content has
been changed
SFC Sequencers When created, an SFC chart has a sequencer (called RUN). It can be extended
to include other sequencers (which can be inserted, moved or deleted in the chart
in the lower bar using the right mouse button). After insertion. the sequencer can
be displayed by clicking the associated tab.
Start Conditions A logic can be constructed in the sequencer properties same as for with the
transition. In this tab, you can define the conditions for the SFC chart/type that are
to start the sequencer (e.g. "SFCName.RUN = Active" starts the sequencer if the
SFC chart is in "Active" mode). At any one time there is always a maximum of
ONE sequencer being processed (active) in an SFC chart. If the start conditions
are fulfilled for several sequencers, the "Priority" property decides which
sequencer is executed (1 is the lowest and 255 the highest priority). If sequencers
with start conditions that are fulfilled at the same time also have the same priority,
the sequencer which is located further to the left is initiated first.
Preprocessing In this tab, you can define the actions for the SFC chart or type that must be
carried out before each sequencer processing call (regardless of whether the
respective current step is in initialization, processing or finishing). Each line
constitutes one statement. Up to 50 statements are possible in each case. You
can change the selection of displayed statements (10) using the vertical scroll bar
at the right-hand side.
Postprocessing In this tab, you can define the actions for the SFC chart or type that must be
carried out after each sequencer processing call. Here, too, up to 50 statements
are permitted.
The preprocessing and postprocessing tabs are actuated before and after each
sequencer cycle, as long as the sequencer is active.
Run sequence The recommended rule here is: the SFC is called after the blocks that it queries in
the transitions, but before the blocks that it writes with commands (to the extent
possible).
Remark You will first create an SFC chart with one sequencer. Then, after more
information is provided, you will add additional sequencers to the SFC chart.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Operating State Logic of a Sequencer
Step Control Modes
T with Transition
T or O with Transition or Operation
T and O with Transition and Operation
B with Operation
T/T and O with step-specific operation
Operating mode
Operator commands
(Online Help Index: operating state logic or OSL)
States Following the download operation to the CPU, the sequential control system is in
a defined state. This defined state is specified with the SFC Editor (default:
Ready). Now the sequential control can begin either automatically (SFC Chart
Properties -> Start Options -> Autostart) or after a start command (menu Chart ->
Properties -> Start Options -> Operating Parameters).
Sequencer Operating State Logic (OSL)
Processing of the sequencers is controlled by the sequencer operating state logic.
The sequencer's operating state logic is defined in the diagram of the state
transitions for sequencer OSL.
Operator Commands You can use commands to change the sequential control system between states
(e.g. Start, Hold, Resume, Abort, Complete).
Step Control Modes The different step control modes modify the behavior of prepared or fulfilled
transitions. A change in the step control modes is possible in all of the operating
states. The individual step control modes mutually exclude each other. The
following step control modes are available:
T with Transition
T or O with Transition or Operation
T and O with Transition and Operation
B with Operation
T/T and O with step-specific operation

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Exercise: Sequence Control - Temperature
START
L<33
SP=70
H>67
SP=50
L<53
SP=30
L<32
END
70
50
30
SP_EXT
PV_IN
t
Step enabling condition:
Process value PV_IN less than 33?
Step enabling condition:
Process value PV_IN greater than 67?
Action:
Set setpoint SP_EXT to 70
• Linear sequence
• Conditions in transitions
• Actions in steps
• Test
Start step
Exercise Create a setpoint control for the temperature controller of reactor A (see slide). If
specific process values are not reached or are exceeded, the setpoint must be set
to defined values.
----------------------------------------------------------------------------------------------------------
Steps 1. Create the SFC chart "SFC_Temp" in the same folder containing the CFC chart
for the temperature controller.
2. First create the layout of the sequencer as per the above illustration, with the
prescribed names for the steps and transitions.
3. Then configure the steps and transitions.
4. Next, compile ("Changes") and download ("Changes") the program.
5. Test the sequence in test mode.
----------------------------------------------------------------------------------------------------------
Procedure Procedure for configuring the steps:
Configure steps Select a step from the sequencer and open it by double-clicking.
In the "General" tab,
enter the name, min. and max. runtime, the step comment in the control, the step
comment in the visualization, and acknowledgment information (if leaving the step
has to be acknowledged).
The "Initialization", "Processing" and "Termination" tabs must be used to
configure the actions in this step.
Go to the "Processing" tab, place the cursor in the first free line, and click the
"Browse" button (at the bottom of the screen) to look the charts in either the "Plant
view" or "Component view" tab until you reach the controller block. Select this
block and select the required parameter in the right pane, e.g.
The SP_EXT parameter from the CTRL_PID block
for the reactor heating control.

Training Center
You now have to assign a value to the selected parameter in your statement (to
the right of := ). Enter the temperature value, e.g. 70.0, in accordance with the
function of the step.
Configure transition
Select a transition from the sequencer and open it by double-clicking.
In the "General" tab,
enter the name, the comment (ES), the OS comment and the
acknowledgment information.
The "Condition" tab is used to configure individual conditions within the step
enabling condition. Here too you can use "Browse" to select the required
parameter from the CFC charts and then use the symbols
=, <>, =>, =<, >, <
to compare it with a specific value or another parameter, e.g.
PV_IN from CTRL_PID < 33.0 (degrees)
Compile and Download
The program is compiled and downloaded (as described in detail in the CFC
section) from the SFC chart using the same procedure as for the CFC.
Compile and download the changes.
The compile and download operation always applies to all CFC and SFC charts
in the program to which the SFC chart belongs, i.e. from where you are initiating
the procedure (they form a common program).
Testing the SFC Test mode is enabled and disabled using the command
Debug Test Mode
Compared to edit mode, the SFC chart window in test mode is expanded to show
an operating and display section at the bottom of the window.
In addition to selection of the operating mode (MANUAL, AUTO); you can also
see the following buttons for the SFC:
- Start - Hold - Resume
- Abort - Complete - Stop
- Restart - Reset - Error (handling)
When the steps and transitions are cycled through, they will display different
colors depending on their state:
Step active pale green
Step held yellow
Step contains errors red
(e.g. maximum runtime exceeded)
Step is inactive but has been processed dark green
Step is inactive and has not yet been processed gray
Transition fulfilled dark green
Transition not fulfilled dark red
Transition inactive gray

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Open SFC (in Test Mode)
1
2
3
5
Menu:
Debug Test Mode
Debug Open SFCs
Select statuses
- Multiple selection possible
- No selection means no
limitation
Select the operating mode
4 Find
Result
6 Select and
open
Analyze SFC In test mode it is possible to display SFCs that correspond to a defined
combination of statuses. To do this, open any SFC and set it to test mode. Only
then is the menu item
Debug Open SFCs offered.
The required steps are shown in the above slide.
Remark The conditions are linked by logical ANDing.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Sequence Control - Reactor
Go to initial state
Reactor C empty and
cold
Fill first component X
to 20% level
Cold and empty
Level >= 20%
Speed monitor
for mixer ON
Speed monitor
for mixer ON
Level >= 80%
Core temperature
to 90 degrees
Process temperature reached
Settling time 2 min
Setpoint tolerance of
temperature controller
reached
Open drain valve,
mixer OFF,
close temperature controller
End initial state
Reactor empty and cold
Fill second component Y
to 80% level
End step
Exercise The sequence for the manufacturing procedure in Reactor A was described in the
"Configuration Overview" tab, page 2. Now implement this sequence using an
SFC chart. Configure, compile, download and test this SFC chart.
----------------------------------------------------------------------------------------------------------
Requirement You have implemented and tested the example in the chart "Exer_Reaci" with the
MOTOR, VALVE and CTRL_PID blocks.
Steps 1. In the plant hierarchy under "ReactorsUnitA", create an SFC chart,
"SFC_ReacA".
2. Establish the sequence of the SFC (see picture above).
3. Configure the actions in the individual steps and the signals to be queried in the
transitions.
4. Compile and download the program.
5. Test the project.
----------------------------------------------------------------------------------------------------------
Procedure You can derive the sequence from the above picture.
Control the filling valves and the drain valve using the VALVE blocks.
Control the mixer via the MOTOR block.
For the "heating" step, set the controller to AUTOMATIC and the external setpoint
to 90°C.
You can include waiting times by inserting an empty step (with a minimum
runtime setting) and an empty transition.

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Date: 07.12.2006
SIMATIC PCS 7
Parameter Control via the SFC
Active outputs of the blocks
SFC releases the
operating mode
switchover again (but
does not change the
operating mode)
LIOP_MAN_SEL=0
LIOP_INT_SEL=0
LIOP_SEL=0LIOP_SEL=0Relinquish control of
block's operating mode
SFC control assumes the control of the blocks (operator cannot operate)
LMNQSTARTQCONTROLPass to system
SFC control relinquishes control of the blocks (operator can operate again)
SP_EXT = (value)AUT_ON (1=on)AUT_OC (1=open)Output commands
For controllers onlyLIOP_INT_SEL=1
SPEXON_L=1
Set external setpoint
AUT_L=1AUT_L=1AUT_L=1Set Automatic mode
SFC determines
operating mode (LInk is
active, not OPerator)
LIOP_MAN_SEL=1LIOP_SEL=1LIOP_SEL=1Assume control of
block's operating mode
RemarkCTRL_PIDMOTORVALVEBlock
Effect
Operating Modes For the SFC to be able to pass its commands to the valves or motors via the
above listed blocks, it must be able to influence the blocks' operating mode (set
the operating mode to AUTOMATIC) and write commands to the suitable inputs.
It must also be possible for the plant operator to intervene manually when the
control has finished. This means the control must relinquish its control over the
blocks again.

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Date: 07.12.2006
SIMATIC PCS 7
Notes

Training Center
Date: 07.12.2006
SIMATIC PCS 7
SFC Operating Mode Logic
Buttons for testing
the SFC
(Online Help Index: operating state logic or OSL)
Operating State Logic for SFC
State The current operating state of the SFC OSL can be modified by the following
events:
- Commands (Start, Resume, Hold, etc.) in operating modes "MANUAL" or
"AUTO".
- External signals (SFC inputs, commands from another SFC, etc.).
- Internal signals (commands from custom sequencers, from test mode or SFC
visualization).
- Implicit state change.
Step enable commands
Start Trigger start processing
Complete Trigger complete processing
Hold Trigger hold processing
Resume Trigger continue processing, e.g. after an error
Error Trigger error processing
Abort Trigger cancel processing
Stop Trigger stop processing
Restart Trigger start processing
Reset Change to Ready state

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Date: 07.12.2006
SIMATIC PCS 7
Run Behavior of an SFC
M
Cycleofthe
SFC
Cycleofthe
CFC
Interaction with Basic Automation (CFC)
The sequential control in the AS is connected to the basic automation via the
action and transition functions. A specific runtime behavior is assigned to each
SFC. Basic automation using the blocks contained in the CFC charts can have a
different runtime behavior than the SFC. You can control an SFC chart using the
external view of the SFC chart contained in the CFC chart. The structure of the
sequence system makes it possible for the sequential control and the basic
automation blocks to run in different cycles, thereby reducing the cyclical load. In
the same way, SFCs can be integrated into runtime groups, and can be given a
different scan rate or phase offset via these groups.
SFC Runtime Options
You can set the sequential control behavior in the runtime options. These can be
set in the dialog field
"SFC Properties Tab: Operating Parameters CPU".
Instruction Output On: The actions of active steps will be processed.
Off: The actions of active steps will not be processed.
Cyclic Execution With "Cyclic Execution: On" the program will automatically revert to "Starting"
following the "Completed" operating state.
With "Cyclic Execution: Off", the program remains in "Completed" state.
Time Monitoring With "Time Monitoring: On", the active time of the step is continuously compared
against the monitoring time after the step is activated (object properties for the
step, "General" tab, "Maximum Runtime" option), and a step error is reported if
the time is exceeded.

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Date: 07.12.2006
SIMATIC PCS 7
Restart Behavior of the SFC(1)
Restart Behavior With PCS 7 Version 7.0 and higher there is an additional possibility for setting the
behavior following a CPU restart (see arrow in slide).
In the previous versions, the SFC was always initialized, and the data valid prior
to the stop were lost (this is now the default setting).
In the new version, the SFC status can be retained. Following a CPU restart, the
SFC then retains its status. Using the SFC and process states, the operator can
then decide how the SFC is to continue working.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Restart Behavior of the SFC(2)
!
?
STOP
Restart
Exercise Set the SFC from the previous exercise such that it retains its state following a
CPU restart. Test the restart behavior of the SFC (by means of CPU stop
followed by a CPU restart) in the "Component X" and "Heat" step. What happens
to the configuration due to this behavior? What happens, for example, with the
filling of component X in the reactor in the meantime (between the CPU Stop and
Resume command by plant operator, once the CPU is running again)?
---------------------------------------------------------------------------------------------------------
Steps 1. Open the SFC, select the menu
SFC Properties "Operating parameters CPU" tab
and select the "Retain SFC status" option.
2. Compile and download the changes.
3. Switch on test mode, and start the SFC.
4. When the "Component X" step is reached in the SFC, stop the CPU (using
PLC Operating Mode Stop).
What is output by the output modules to which the valves (simulation) are
connected? What does this mean for a real plant?
5. From the last screen form, carry out the CPU restart. You must then decide at
some time whether the SFC is to continue or stop/abort.
A new command is not output by the SFC up to this point. What commands are
output by the valve, motor and controller blocks? Note that the blocks mentioned
also exhibit a restart behavior when the CPU is restarted, but they then call their
program cyclically in the cyclic interrupt OB with the parameters which they find
there.

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Date: 07.12.2006
SIMATIC PCS 7
External View of SFC
External View The SFC chart has a standard interface through which it can be controlled using
CFC interconnections. This interface is represented as a graphic "external view"
of the chart.
Activate the following menu command in the SFC
View External View
to open the CFC with an external view window.
Representation The external view shows the SFC as a block with an SFC chart symbol in the
block header. The block name is the SFC chart name and cannot be changed.
Interconnection Inputs can be interconnected to other objects, global addresses or textual
interconnections.
Please refer to the online help for more information about the individual
parameters (Help on SFC External View... See also... Standard interface for
SFC charts).
There the parameters are listed both alphabetically and according to their use.
You cannot add further objects to the CFC chart showing the external view of the
SFC. All interconnections must pass over the edge of this chart.
Tip Open the external view of the SFC (= a CFC window) and the CFC chart from
which the control is to be influenced (= a second CFC window). Arrange both
windows side by side. Interconnect the blocks as described in the CFC chapter.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Exercise: Adding Two Sequencers to the Sequential Control
Start condition
RUN sequencer
Start condition
HOLD sequencer
DB
SFC_ReacA
Save state
Safe state
Output commands
Set operating modes for
operation
Restore state
HOLD!
Start condition
Resuming
sequencer
?
?
Exercise Supplement the sequential control for Reactor A as follows:
If the plant operator issues a hold command for the SFC control, a second "HOLD
sequencer" will start up. This is to ensure that valves V1, V2 and V3 close, the
mixer is switched off and the temperature controller is set to manual operation
with a preset manual value. The HOLD operating state must not be reached until
the two above-mentioned commands have become effective. This state must be
saved in a DB.
The operator can perform operations in the HOLD state. If the control is to exit the
"HOLD" state, the valves, mixer and controller must be switched back to the state
saved in the DB, i.e. the state they were in when the HOLD command was
issued. This is achieved by using a third "CONTINUE sequencer" which resets
the blocks to the desired state and is only exited after a check has been
performed.
-------------------------------------------------------------------------------------------------------
Steps 1. Insert additional sequencers in the SFC_ReacA.
2. Set the chart properties for the two additional sequencers.
3. Create data block to save data when control is in HOLD state.
4. In SFC_ReacA complete programming of the "HOLD" and "CONTINUE"
sequencers.
-------------------------------------------------------------------------------------------------------
Procedure 1. Insert two additional sequencers in SFC_ReacA. With the SFC open, go to the
"RUN" tab (below),
right-click and select Insert Sequence at End
to insert another sequencer. One SFC can process up to eight sequencers in
alternation.
With the SFC open, set the chart properties via
Chart Properties Operating Parameters tab
as follows:
Step Control Mode: T, Operating mode: MANUAL; Instruction Output: checked,
Use default operating parameters when SFC chart starts: checked.

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Holding Sequencer with Data Block for Values to be Saved
"Normal" reactor sequencer
START
(save
or restore)
END
(empty)
Checking
Create Data Block
Create a data block (DB) (e.g., DB1 with a symbolic name, "ReacA_DB"). This
block is to be used to save the necessary states when the main sequencer is held
(see above for possible structure).
To do this, you need to switch to the project component view. Select the block
folder, then
right-click and select New Object... Data Block
to create the global DB1. Enter the symbolic name "ReacA_DB" in the Properties
window.
Then select the block,
right-click and select Open to start the data block editor (see above).
Define the necessary parameters in the corresponding data formats.
Configuring SFC with Two Additional Sequencers
Configure the HOLDING SFC and the RESUMING SFC.
HOLDING SFC This is started when a command is received to hold the RUN SFC.
"Save" Step In the "Save" step, the relevant pending commands/data are saved in DB1 (see
above, content of DB1) and then the desired settings are made.
Transition This checks whether the operating modes and values that were set as a
precautionary measure have become effective. The sequencer is completed only
after the transition is fulfilled. The SFC chart then changes to HOLD state.
RESUMING SFC This is started when a command is received to resume the RUN SFC.
"Restore" Step The "Restore" step is the opposite to the "Save" step in the HOLDING sequencer,
i.e. the data is read from DB1 and distributed across the relevant block
parameters/inputs (from right to left).
Transition This checks whether the saved states have become effective again before the
RUN sequencer resumes activity.

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Date: 07.12.2006
SIMATIC PCS 7
Creating an SFC Type
Several sequencers possible for
one SFC type
SFC Type In SFC V6.1 there is an SFC type in addition to the SFC chart. This makes it
possible to define sequential controls, including an interface. The runtime logic of
the SFC type is based on the interface of the SFC type, i.e. the SFC type cannot
access just any process signals. Like function blocks, SFC types must be placed
on a CFC chart, where they are given an SFC instance.
Creating an SFC Type
SFC types cannot be inserted into the plant hierarchy, since they cannot run on
their own. Instead, they are created using
Insert new object -> SFC type
in the component view in the SIMATIC Manager or
SFC -> New (select "SFC type" in the "Object type" field)
in the SFC editor.
Manipulating the SFC Type
The SFC type is a manipulable object like the SFC chart; however, it has its own
symbol to distinguish it from the latter. The attributes necessary for the SFC type
(e.g. S7_m_c) are preset. Seven messages requiring acknowledgement and five
that do not require acknowledgement can be configured for each SFC type. The
other available messages are required by the SFC type itself.
Configuring Using the SFC Type
Only the interfaces for the SFC type can be used to configure actions in the steps
and the start and step enabling conditions. In other words, external access is via
the SFC type interface only.

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Date: 07.12.2006
SIMATIC PCS 7
Creating an SFC Instance
Operating modes
Commands
Command enables
Lock
Control strategy
Step control mode
Execution option
Operating state
Operating mode
Group display
Fault indication
Control strategy
SFC Instance If an SFC type is used, it is inserted into a CFC chart. An SFC instance will be
assigned to it at this point. SFC instances are therefore always assigned to the
CFC chart and are addressed via the chart. By assigning the CFC chart to the
plant hierarchy, the instances that it contains are also indirectly assigned to the
plant hierarchy.
Messages SFC instance messages can be configured in the SFC via
SFC Message
or in the CFC in the object properties dialog box. The messages are PCS-7-
compliant and can also be provided with associated values, for instance.
Configuration When you configure SFC instances, the interface and the sequencers must not
be changed, as they are specified identically for all instances through the SFC
type. Changes that are made directly to the instances may be loaded at any time,
even if the SFC instance is currently being processed in the automation system.
After you have configured any changes, you must use the function
OS Compile
to ensure that the current data are also available on the OS.
Compile If the program is compiled on the ES side, the SFC instances will be compiled
along with them. For any given SFC instance, 1+n data blocks will be created
(where n = number of sequencers within an SFC).

Training Center
Date: 07.12.2006
SIMATIC PCS 7
Miscellaneous Reference Data
Run Sequence
Calling up Reference Data
When you have opened a CFC or SFC chart, you can use
Options Chart Reference Data...
or the symbol in the function bar to display and print the information shown below
in list form or in tree structure. You can search for the desired output using the
View menu command.
Run sequence Graphic representation of the entire run sequence of a CPU.
Cross References Chart Element Address
A list of all global addresses used in the project, with the elements that have
access to them.
Cross References SFC Chart Element
This displays the existing accesses to the block interfaces in the CFC from any
SFC charts.
Block interconnections
List of all interconnected chart elements.
Access in SFC types
List of all read and write accesses of the SFC types to their own interface.
Cross References Chart Element Runtime Groups
Existing accesses from any CFC and SFC charts for all runtime groups.
Cross References Block Types
The block types used and the locations (CFC chart) where they are used.
S7 Resource Allocation
The assignment between CFC configuration objects and S7 resources.

Training Center
Local Data All OBs in the program, with the calculated local data requirement and the local
data sizes for the individual priority classes as configured offline, and those
actually available online.
Block Call Hierarchy
Graphic representation of the call hierarchy for all blocks in the current program.
Textual Interconnections
All open textual interconnections are listed.
Statistics Number of all objects used by CFC, SRC; S7 resources and the time stamp from
the current program, as well as the HMI-relevant block instances for the project.
You can use this information to check your configuration structure. For example,
you can use the "Cross-References Chart Element Addresses" list to
determine which symbols are used and how often, and whether write accesses
are synchronized. See the online help for further information.
Note The "Reference Data" function is also available in SIMATIC Manager. With PCS 7
projects it is only offered in the context of the chart folder of the CPU.

Ch6 v70 sfc_en

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